Chlorophyll-aChlorophyll-a measures the amount of algae in the water. Too much algae in the water is not good for the Lagoon’s health and so the higher the chlorophyll-a levels, the lower the score. The table below shows that chlorophyll-a scores dramatically declined from 2009–2016 as algae super blooms expanded through the Lagoon. Starting in 2017, some areas of the Lagoon started to improve.

Historically, algae blooms and fish kills would be occasional events during warm summer months. However, the IRL has recently experienced persistent algae blooms covering hundreds of acres and lasting for months, resulting in extensive fish kills, seagrass losses, and marine mammal deaths. Canal discharges also carry toxic algae into areas of the South IRL.


Chlorophyll-a Scores
No data (ND) in the table below demonstrates that water quality samples were not collected in this area of the lagoon.

The regulatory targets for chlorophyll-a are linked here.

Click here to see how chlorophyll-a scores were calculated.